Engstrand Tate O, Cope Emily M, Vasquez Guillermo, Haddock Jo W, Hertz Mary B, Wang Xiaoping, Latturner Susan E
Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States.
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Inorg Chem. 2020 Aug 17;59(16):11651-11657. doi: 10.1021/acs.inorgchem.0c01505. Epub 2020 Aug 4.
La(FeC)H was synthesized from the reaction of iron and anthracene in La/Ni eutectic flux. Anthracene was the source of both the carbon and hydrogen in the product. The structure of this metal carbide hydride features hydride ions in tetrahedral interstitial sites surrounded by lanthanum ions, which was confirmed by single-crystal neutron diffraction studies. The trigonal planar FeC units in which the central iron atom is coordinated by three ethylenide groups are similar to those found in LaFeC, a previously reported compound that is formed in the absence of a hydride source. Magnetic susceptibility data confirm that the iron sites do not have magnetic moments. Density of states calculations indicate that La(FeC)H is metallic and is stabilized by the incorporation of hydride anions.
